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Gas volumes and moles

Skipping the first q...you would do 5.29/211.16 and get 0.025.

Then, the MS says you do (5/2) x 0.025

How and where do you get 5/2 from?

Thanks, I'm really struggling with this right now...
5 is the number of moles of gas produced (4 of NO2 +1 of O2), dont count the other product because it's a solid,and the 2 is the number of moles used. So for every 2 moles of Sr (NO3)2 there are 5 moles of gas produced. Hence calculating the moles of gas produced and putting the values into the equation for volume gives the volume of gas obtained by student.
(edited 8 years ago)

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